# define _CRT_SECURE_NO_WARNINGS
# include <stdio.h>
# include <math.h>
int main()
{
	double a = 0.01;
	double b = 0.01;
	double c = 0.01;
	double temp = 0.01;
	scanf("%lf %lf %lf", &a, &b, &c);
	if (a>b)
	{
		;
	}
	else
	{
		 temp = a;
		 a = b;
		 b = temp;
	}
	if (a > c)
	{
		;
	}
	else
	{
		temp = a;
		a = c;
		c = temp;
	}
	if (b > c)
	{
		;
	}
	else
	{
		temp = b;
		b = c;
		c = temp;
	}
	 if (c+b>a)
	 {
		 if (fabs(a - b < 1E-2)&& fabs(b - c >= 1E-2) || fabs( b- c < 1E-2) && fabs(a -b  >= 1E-2) && (fabs(b * b + c * c - a * a) >= 1E-2))
			 printf("These three sides can form a lsosceles triangle.\n");
		 else if ( fabs(a-c<1E-2))
			 printf("These three sides can form a equilateral triangle.\n ");
		 else if ((fabs(b * b + c * c - a * a) < 1E-2) && fabs(b - c >= 1E-2)&& fabs(a - b >= 1E-2))
		 printf("These three sides can form a right-angle scalene triangle.\n");
		 else if (fabs(a - b < 1E-2)  || fabs(b - c < 1E-2) && (fabs(b * b + c * c - a * a) < 1E-2))
		 printf("These three sides can form a right-angle isosceles triangle.\n");
		 else
			 printf("These three sides can form a normal triangle.\n");
	 }
	 else
		 printf("These three sides cannot form a triangle.\n");
	return 0;
}